rev: added a file to support moderations endpoint (#21)

* Added support for Moderations API

* gofmt moderation.go

Author: noona

moderation.go

@@ -0,0 +1,69 @@
+package gogpt
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"net/http"
+)
+
+// ModerationRequest represents a request structure for moderation API
+type ModerationRequest struct {
+	Input string  `json:"input,omitempty"`
+	Model *string `json:"model,omitempty"`
+}
+
+// Result represents one of possible moderation results
+type Result struct {
+	Categories     []ResultCategories     `json:"categories"`
+	CategoryScores []ResultCategoryScores `json:"category_scores"`
+	Flagged        int                    `json:"flagged"`
+}
+
+// ResultCategories represents Categories of Result
+type ResultCategories struct {
+	Hate            int `json:"hate"`
+	HateThreatening int `json:"hate/threatening"`
+	SelfHarm        int `json:"self-harm"`
+	Sexual          int `json:"sexual"`
+	SexualMinors    int `json:"sexual/minors"`
+	Violence        int `json:"violence"`
+	ViolenceGraphic int `json:"violence/graphic"`
+}
+
+// ResultCategoryScores represents CategoryScores of Result
+type ResultCategoryScores struct {
+	Hate            float32 `json:"hate"`
+	HateThreatening float32 `json:"hate/threatening"`
+	SelfHarm        float32 `json:"self-harm"`
+	Sexual          float32 `json:"sexual"`
+	SexualMinors    float32 `json:"sexual/minors"`
+	Violence        float32 `json:"violence"`
+	ViolenceGraphic float32 `json:"violence/graphic"`
+}
+
+// ModerationResponse represents a response structure for moderation API
+type ModerationResponse struct {
+	ID      string   `json:"id"`
+	Model   string   `json:"model"`
+	Results []Result `json:"results"`
+}
+
+// Moderations — perform a moderation api call over a string.
+// Input can be an array or slice but a string will reduce the complexity.
+func (c *Client) Moderations(ctx context.Context, request ModerationRequest) (response ModerationResponse, err error) {
+	var reqBytes []byte
+	reqBytes, err = json.Marshal(request)
+	if err != nil {
+		return
+	}
+
+	req, err := http.NewRequest("POST", c.fullURL("/moderations"), bytes.NewBuffer(reqBytes))
+	if err != nil {
+		return
+	}
+
+	req = req.WithContext(ctx)
+	err = c.sendRequest(req, &response)
+	return
+}